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[Xen-devel] [PATCH] IOMMU: avoid NULL deref in iommu_lookup_page()

Luckily the function currently has no callers - it would have called
through NULL for both Arm and x86/AMD.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -409,7 +409,7 @@ int iommu_lookup_page(struct domain *d,
     const struct domain_iommu *hd = dom_iommu(d);
-    if ( !iommu_enabled || !hd->platform_ops )
+    if ( !iommu_enabled || !hd->platform_ops || !hd->platform_ops->lookup_page 
         return -EOPNOTSUPP;
     return hd->platform_ops->lookup_page(d, dfn, mfn, flags);

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